Lamb wave temperature compensation method based on adaptive filter ADALINE network

One of the key issues that need to be addressed in current PZTs array and Lamb wave based Structural Health Monitoring (SHM) methods are the influence of environmental conditions, especially temperature. A new temperature compensation method based on adaptive filter adaptive liner neural (ADALINE) network including a tapped delay line has been developed to compensate the amplitude-change and phase-shift due to temperature. Network construction and procedure of compensation are discussed. The advantage of this temperature compensation method is that only a few baselines are required for a large temperature range. Experiments are conducted on a stiffened carbon fiber composite panel to verify the temperature compensation method under a large temperature range from -40 degrees C to 80 degrees C. Results show that this method can compensate for both S-0 mode and A(0) mode. Damage image results show that after the compensation great accuracy for Lamb wave-based damage detection is achieved.